x=0:1:5;
a=1*x;
b=2*x;
c=3*x;
d=4*x;
e=5*x;
plot(x,a,'x') %changes points to x's
hold on
plot(x,b,'o') %changes points to o's
hold on
plot(x,c,'*') %changes points to *'s
hold on
plot(x,d,'+') %changes points to +'s
hold on
plot(x,e,'.') %changes points to .'s